Writing & AI tools / Compare
DeepL vs Undetectable AI
Both do 1 of the same writing & AI tools task. Below is what each says about its own limits and pricing, and how each ranks on signals we can measure or quote.
Disclosure: agathox makes some of the tools listed here. They are labelled and scored by the same method as every other tool.
A
DeepL
Explore our AI suite and get more done: Translate speech, text, and media, or integrate the DeepL API.
Signals score: 4.1 / 5 · not a hands-on test
Visit www.deepl.com/enB
Undetectable AI
Undetectable AI is a tool that rewrites AI-generated text to read like human writing. It helps students, content writers and professionals. Free to start.
Signals score: 4.1 / 5 · not a hands-on test
Visit undetectable.aiPricing, limits and privacy
- Free tier
- A: Free version allows 1 file translation per month (up to 5 MB) and 50,000 characters of text translation per month, plus 1 glossary and 1 saved translation.
- B: Only a free trial limited to 250 words is described. More use needs a paid plan.
- Paid plan
- A: Prices shown for Germany in EUR, billed annually, VAT included. Individual EUR 7.49 per month (300,000 characters, 3 files). Team EUR 24.99 per user per month. Business EUR 49.99 per user per month. Enterprise is custom. Write Pro add-on EUR 6.99 per user per month. Monthly prices not shown.
- B: 10K words per month: $9.99 monthly or $5.00 per month billed yearly ($60 per year). 20K words: $19.00 monthly or $9.50 per month yearly ($114). 35K words: $31.00 monthly or $15.75 per month yearly ($189). 50K words: $42.50 monthly or $21.25 per month yearly. Business pricing is custom.
- Signup
- A: Not stated for the free version. Paid subscriptions are used by logging in with a DeepL account.
- B: Not stated.
- Watermark
- A: Not applicable.
- B: Not stated. The pricing page lists a feature called 'Watermark and future proof' without explaining it.
- Where files go
- A: Privacy policy says text is processed by DeepL. Free-version content is kept for a limited period to train and improve its models. Pro texts are deleted after the service is done and not used for training. Pro documents are processed in the EEA.
- B: Privacy notice says data may be transferred, stored and processed in other countries, and kept as long as needed for its purposes. It does not describe how entered text is handled, and its server-location line is incomplete.
From each tool's own pages, checked 2026-11-01. Prices and limits change; check the tool before you rely on them. Sources are listed on each tool's page.
Compare on a task
Neither tool has been hands-on tested on these tasks yet, and we do not guess. Open a task to see both ranked with every other tool.
- Only DeepL: Translator
- Only Undetectable AI: AI content detector
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